misc:

extract App.axaml;
Android demo display label.

demo/Semi.Avalonia.Demo/App.axaml.cs

@@ -0,0 +1,29 @@
+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+using Semi.Avalonia.Demo.Views;
+
+namespace Semi.Avalonia.Demo;
+
+public partial class App : Application
+{
+    public override void Initialize()
+    {
+        AvaloniaXamlLoader.Load(this);
+    }
+
+    public override void OnFrameworkInitializationCompleted()
+    {
+        switch (ApplicationLifetime)
+        {
+            case IClassicDesktopStyleApplicationLifetime desktop:
+                desktop.MainWindow = new MainWindow();
+                break;
+            case ISingleViewApplicationLifetime singleView:
+                singleView.MainView = new MainView();
+                break;
+        }
+
+        base.OnFrameworkInitializationCompleted();
+    }
+}